Fabricated Body Gas Valve Systems...an automated shutoff system you can count on for safe, reliable performance – every time. No leaks. No out-of-sequence operation. And that’s

Fabricated Body Gas Valve Systems

appropriate accessories, are Factory Mutual (FM) approved as automatic gas safety shutoff valves. Ruggedly constructed, the Trifecta system provides all the blocking and venting functions needed for safe automated gas burner operation.

Engineered Valves offers T4000 series valve systems in a broad range of sizes to meet the needs of any capacity gas burner or igniter. When necessary, valves can be specially configured to address specific requirements for piping design and support, and hazardous location classifications.

When you are burning flammable or fuel gases, you need an automated shutoff system you can count on for safe, reliable performance – every time. No leaks. No out-of-sequence operation.

And that’s where Engineered Valves Group can help. Skotch valves are unique gas burner shutoff valve systems designed and manufactured with innovative technology.

The Skotch Trifecta T4000F valve systems offer a superior alternative to conventional multiple-valve packages. The Skotch Trifecta is a complete valve system contained within a single housing. Fail-closed models, which include

Skotch® Trifecta Gas Valve Systems

A safer, more reliable engineered system for automated burner shutoff of gas service in your plant.

Shown are eight T4300F (3 inch) Skotch Trifecta gas valve systems replacing the need for twenty-four independently actuated valves. Installation time and space are reduced considerably.

Skotch® Trifecta 2 02 0 01/14

Skotch® Trifecta Gas Valve Systems

In many systems, vent valves are direct solenoid operated, with no provision for ensuring positive closure. The result can be continuous leakage into vent piping when the block valves are open. Installation of the conventional three-valve system can require as many as nine different connections. The Skotch Trifecta system requires only three simple connections; inlet, outlet, and vent. In addition, the Trifecta automatically gives you the correct vent size based on the recommendations of NFPA and IRI.

Engineered Valves created the T4000 series as a fully integrated system engineered for gas burner shutoff applications. The result is elimination of performance problems and a device that offers continuous, reliable, trouble-free service in your most critical applications.

A Look at the Problem Strings of separate valves or multiple valve manifolds are frequently used to provide automated burner shutoff in fuel gas applications. Such arrangements often consist of a vent valve and two block valves, with each valve being driven by a separate actuator.

Failure of all actuators to operate in sequence is a concern. Sometimes a single operator is mechanically linked to drive both block valves in tandem. In such a configuration, obstruction or linkage problems that affect one valve will prevent the other from closing, so the advantage of using a double block is lost.

T4600F (6 inch) Skotch Trifecta gas valves are installed above the burner level in the horizontal position, which reduces burner front clutter.

2 03 0 01/14 Skotch® Trifecta

The patented Skotch Trifecta T4000F series fabricated body valve system is a safe, cost-effective, reliable alternative to multiple valves and manifolds found in fuel gas systems. Used in applications where double block and vent is required, the T4000F combines the function of two independent block valves with a normally open vent valve in a single, compact unit. This makes it ideal for boilers, furnaces and process heating equipment firing natural gas, propane, and other fuel gas.

A single actuator mechanically opens the two block valves and closes the vent, assuring that the valves operate in sequence. Use of independent spring-to-close block valves ensures that obstructing one valve does not prevent the other from closing. The Trifecta valve system has no exposed linkage that can be damaged and requires no adjustments for proper operation.

Because Skotch Trifecta valve systems are custom built for each application, we are able to modify our standard offerings to suit customer needs. Installation flexibility is increased since the outlet and vent ports can be rotated at 90° increments, and the valves can be mounted in any orientation. The valve system is completely self-contained and all necessary accessories are provided, including position indication switches and junction box.

Skotch Trifecta gas valve systems have been proven as a superior alternative to multiple valves systems by decreasing installation space, time, and costs while increasing safety and reliability.

Features and Benefits

• Provides all necessary block and vent functions in a single integral unit

• Use of a single actuator ensures reliable in sequence operation. Block valve closure springs are independent for reliable closure

• Fabricated design allows for installation flexibility

• Compact design saves space

• All three valves provide ANSI/FCI 70-2 Class VI shutoff with over-travel and metal-to-metal back up seats

• Complies with NFPA and IRI’s recommended good design practices for vent port size

• Outlet and vent ports can be rotated at 90° increments, and the valves can be mounted in any orientation

• Built in test port to allow leakage testing while valve is in line

• No external linkage; rugged enclosure protects all components

• Designed for in-line maintenance

Skotch® Trifecta T4000F Series Gas Valves


Skotch® Trifecta T4000F

Leak Test Port

Actuator

Outlet Return Spring

Vent Connection

Outlet Block

Vent Post

Inlet

Inlet Block

Closed

Inlet Return Spring

Vent Cage

Outlet

Ported Valve Stem

Closed Position

• Inlet block closed by inlet return spring

• Outlet block closed by outlet return spring

• Vent is open through ported valve stem (path as marked by orange arrows)

• No gas flow

Operating Sequence for the T4000F in the Closed Position



Leak Test Port

Actuator


Vent Connection

Outlet Block

Vent Post

Inlet

Inlet Block

Intermediate

Inlet Return Spring

Vent Cage

Outlet

Ported Valve Stem

Intermediate Position(The valve does not stop in this position)

• Outlet block open

• Vent cage positioned over vent post to completely close the vent

• Inlet Block valve still closed

• No gas flow

• The valve strokes through this position on its way toward the open position

Operating Sequence for the T4000F in the Intermediate Position


s - Mechan

Leak Test Port

Actuator


Vent Connection

Outlet Block

Vent Post

Inlet

Inlet Block

Open

Inlet Return Spring

Vent Cage

Outlet

Ported Valve Stem

Open Position

• Outlet block open

• Vent cage positioned over vent post to completely close the vent

• Inlet block valve open

• Gas flows from inlet to outlet


Operating Sequence for the T4000F in the Open Position



T4000F Body Configurations The two-inch (T4200F) through six-inch (T4600F) valve systems are fabricated design. As a result, outlet and vent connections as well as the junction box can be located at

any point in 90° in relation to the inlet connection. Listed here are standard orientations from which to choose. Note: Vent and junction box should not be in the same location.

Specifying Configurations 2" through 6"


Actuation: T4x05 – Fail in last position T4x06 – Fail closed, FM approved T4x07 – Fail closed, non-FM approved Pneumatic Supply: 70 to 120 PSIG clean, dry air Ambient Temperature Rating: Standard: 140°F (FM approved) Optional: 180°F (non-FM approved) Construction Materials: Body: ASTM A105 Carbon Steel Trim: 6061 – T6 Aluminum, ASTM AS11 Type 316SS Seals: Buna-N standard; Consult factory for Viton options Electrical Rating: Standard – Nema 1, 3, 4, 13 Optional – Nema 7, 9 (Class 1 Div 2 Gr B, C, D) Pilot Solenoid Voltages: 110 VAC, 220 VAC 50/60 Hz 12, 24, 48, 125 VDC Switch Rating: 10 Amps at 125 VAC Ingress Protection: 4, 4X, 6P Stroke: T4200: 3" T4300: 3.5" T4400: 4" T4600: 5" Orientation: May be installed in any orientation

Design Pressure and Temperature: Max. operating pressure – 50 PSIG Max operating temperature – 180°F Shutoff Classification: All ports soft seated with metal to metal backup New valve: meets or exceeds ANSI/FCI 70-2 Class VI Durability: meets or exceeds FM 7400 standard for Safety Shutoff Valves (SSOV) Sizes & Weights: Series Line Size Vent Size Weight* T4200F 2” 1” 137 lbs T4300F 3” 1 ¼” 240 lbs T4400F 4” 2” 265 lbs T4600F 6” 2 ½” 515 lbs *Approximate depending on options selected Cv Ratings: T4200F – 80 T4300F – 167 T4400F – 245 T4600F – 430 End Connections: Inlet/Outlet: ANSI B16.5 Cl 150 Raised Face Flange Vent: ANSI B2.1 Female NPT, Sch 40 or 80 Spigot, Buttweld (CL 150 Raised face flange optional)

Specifications for the T4000F


T4000F Systems are covered under U.S. Patent No. 4,798,223 and other foreign patents.

General Dimensions (Inches)

General Dimensions (Metric)

Dimensional Information



2" through 6" The following charts depict the relationship between flow (SCFH) and pressure drop (PSI) for 2 inch through 6 inch Trifecta valves. Data is given at various inlet pressures (PSIG). Follow known flow up the chart until you intersect the known operating pressure. Where the two lines intersect, look to the left for the pressure drop.

Example: 3” valve system with 100,000 SCFH natural gas flow operating at 15 PSIG inlet pressure the pressure drop will be 2.3 PSI. Selecting a 4” valve system with the same conditions will result in a pressure drop of 1.0 PSI

Estimated pressure drops are reported for the entire Trifecta double block and vent system.

Figures can be used to compare relative performance of the various valve sizes. Please note that calculations do not take into effect external piping elements, such as reducers, tees, and elbows. When comparing this data with that of other manufacturers, please ensure any comparison figure estimates the performance over two block valves closely-coupled and not just a single valve.

For other process conditions, calculations may be performed using the Cv values noted in valve specification data, or contacting the factory. Calculations are based on natural gas at 0.65 specific gravity, 60 degrees F.

Calculations are based on natural gas at 0.65 specific gravity, 60 degrees F.

Flow Capacity Charts


Opening 1. With the block valves closed and the vent open, gas enters the inlet port and is blocked by two flow-to-close plugs (the inlet and outlet block). To positively prevent fuel leakage into an idle burner, the chamber between is vented to atmosphere through the ported outlet valve stem. (Figure 1)

2. Pneumatic pressure at the top of the actuator cylinder moves the piston downward, compressing the outlet return spring and forcing the outlet block open. The cage slides down over the post until the machined surfaces inside the cage come in contact first with a spring-energized soft seal, and then with a metal back-up seat, closing the vent. (Figure 2)

3. With the vent closed, the system continues to stroke, pushing the inlet block open, so that gas begins to flow. A travel stop halts valve movement after full stroke is achieved. (Figure 3)

Closing 1. To close the valve and open the vent, pilot air is exhausted from the actuator. Return springs drive the inlet and outlet valves toward their seats. (Figure 3)

2. As the inlet valve enters its seat ring, gas flow is isolated. The inlet block moves through its overtravel until contact is made with the metal back-up seat to fully close the inlet valve (Figure 2)

3. As the outlet valve continues moving toward its seat, the cage separates from the post, opening the vent. The outlet block enters the seat ring, isolating the vent from downstream piping. When the outlet block contacts the metal back-up seat, the system is fully closed. (Figure 1)


Principles of Operation


Figure 1

Figure 2

Figure 3

Cast Body Gas Valve Systems

Skotch® Trifecta T4000C Series Gas

Advantages of using the T4000C valve system vs. conventional multiple valve and manifold setups include:

• Compact for easier installation

• Less maintenance and lower cost of ownership

• Available Factory Mutual (FM) approved configurations (fail closed only)

• No out-of-sequence operation

• Can be installed in any orientation

Because the T4000C valves operate using a single actuator, problems such as out-of-sequence operation, jamming, and maladjustment of linkage drive systems are eliminated.

For larger igniters and smaller main burners, the patented Skotch Trifecta T4000C series cast-body valve system is a safe, cost-effective, reliable alternative to the multiple valves and manifolds found in fuel gas systems.

Used in applications where double block and vent is required, the T4000C combines the functions of two independent block valves with a normally open vent valve in a single, compact unit making it ideal for boilers, furnaces, and process heating equipment firing natural gas, propane, or other fuel gas. The unique design includes three ports: inlet, outlet, and vent. The cast steel body contains two valve plugs – an inlet and outlet block. The chamber between is open to vent through the ported inlet stem.

Flow-to-close inlet and outlet blocks are sized for full flow to minimize pressure loss; increasing inlet pressure forces the blocks tighter on their seats. Soft seals with over-travel and metal-to-metal back up seats ensure positive ANSI/FCI 70-2 Class VI closure. Proof-of closure (POC) switch is standard.

T4100C (1”)Shown with optional Proof of Open switch

T4150C (1.5”)


Skotch® Trifecta T4000C

Flow Capacity for the T4100CThe following chart depicts the relationship between flow (SCFH) and pressure drop (PSI) for the T4100C Skotch Trifecta valve system. Data is given at various inlet pressures (PSIG). Follow known flow up the chart until you intersect the known operating pressure. Where the two lines intersect, look to the left for the calculated pressure drop. T4100C example: With 10,000 SCFH flow operating at 15 PSI the calculated pressure drop will be 3.3 PSI. Calculations are based on natural gas at 0.65 specfic gravity, at 60° F.

Specifications for the T4100C


Construction Materials: Body: ANSI B16.34 compiant; cast carbon steel per ASTM A216 Gr. WCB Flanges: ASTM A479 Type 304, ASTM A108 1018 Trim: ASTM Type 300 series stainless steels Seals: Buna-N standard; Consult factory for Viton options Switch / Solenoid Electrical Ratings: Standard: Nema 1, 3, 4, 13 Optional: Nema 7, 9 (Class 1 Div 2 Gr. B, C, D) Solenoid Supply Voltages: 110 VAC, 220 VAC 50/60 Hz 12, 24, 48, 125 VDC Switch Rating: Internal Switches - 7 Amps @ 120 VAC External Switches - 10 Amps @ 125 VAC Ingress Protection: Standard: Nema 4 Optional: Nema 4X Stroke: ˜1" Orientation: May be installed in any orientation

Design Pressure and Temperature: Max. operating pressure: 50 PSIG Operating temperature range: -20ºF to 150ºF Shutoff Classification: All ports soft seated with metal to metal backup New valve: meets or exceeds ANSI/FCI 70-2 Class VI Durability: meets or exceeds FM 7400 standard for Safety Shutoff Valves (SSOV) Inlet/Outlet Size: 1" Sch. 40 (Sch. 80 optional) Weight: Approximately 35 lbs depending on options selected CV Rating: 14 End Connections: Inlet/Outlet: Sch. 40 or 80 Spigot; Butt Weld; ANSI Class 150 Raised-Face Flange; Male NPT in Sch. 80; Socketweld Vent: ANSI B2.1 FNPT Actuation: Electropneumatic T4105C- Fail Last Position T4106C- Fail Closed (Safe), FM Approved T4107C- Fail Closed, non-FM Approved Flow Direction: Left-to-right or right-to-left. Field reversible Pneumatic Supply: Clean, dry air at 60 to 120 PSIG Ambient Temperature Rating: Standard: 140ºF (FM approved) Optional: 180ºF (non-FM Approved)

T4100C Cv = 14


T4000C systems are covered under U.S. Patent No. 5,165,443 and other foreign patents.Dimensions are inches (mm)

Externally Mounted Limit Switch Option

Dimensional Specifications for the T4100C



The following chart depicts the relationship between flow (SCFH) and pressure drop (PSI) for the T4150C and T4200C Trifecta valve systems. Data is given at various inlet pressures (PSIG). Follow known flow up the chart until you intersect the known operating pressure. Where the two lines intersect, look to the left for the calculated pressure drop.

T4150C example: With 20,000 SCFH flow operating at 15 PSI the calculated pressure drop will be 1.2 PSI.

Calculations are based on natural gas at 0.65 specific gravity, at 60° F.

Flow Capacity for the T4150C and T4200C

Specifications for the T4150C and T4200C


Ambient Temperature Rating: Standard: 140ºF (FM approved) Optional: 180ºF (non-FM Approved) Construction Materials: Body: ANSI B16.34 compiant; cast carbon steel per ASTM A216 Gr. WCB Flanges: ASTM A479 Type 304, ASTM A108 1018 Trim: ASTM Type 300 series stainless steels Seals: Buna-N standard; Consult factory for Viton options Switch / Solenoid Electrical Ratings: Standard: Nema 1, 3, 4, 13 Optional: Nema 7, 9 (Class 1 Div. 2 Gr. B,C,D) Solenoid Supply Voltages: 110 VAC, 220 VAC 50/60 Hz 12, 24, 48, 125 VDC Switch Rating: 10 Amps at 125 VAC Ingress Protection: Standard: Nema 4 Optional: Nema 4X Stroke: ˜2.3" Orientation: May be installed in any orientation

Design Pressure and Temperature: Max. operating pressure: 60 PSIG Operating temperature range: -20ºF to 180ºF Shutoff Classification: All ports soft seated with metal to metal backup New valve: meets or exceeds ANSI/FCI 70-2 Class VI Durability: meets or exceeds FM 7400 standard for Safety Shutoff Valves (SSOV) Sizes & Weights: Series Line Size Vent Size Weight* T4150C 1.5” 3/4” 111 lbs T4200C 2.0” 1” 162 lbs *Approximate depending on options selected End Connections: Inlet/Outlet: ANSI B16.5 Cl 150 Raised Face Flange Vent: ANSI B2.1 Female NPT, Sch 40 or 80 Spigot, Buttweld (CL 150 Raised face flange optional) Actuation: T4xx5 – Fail in last position T4xx6 – Fail closed (safe), FM approved T4xx7 – Fail closed, non-FM approved Flow Direction: Left-to-right or right-to-left Field reversible (consult factory) Pneumatic Supply: 70 to 120 PSIG clean, dry air

Dimensions are inches (mm) T4000C systems are covered under U.S. Patent No. 5,165,443 and other foreign patents.


Dimensional Specifications for the T4150C and T4200C


Opening 1. Energizing the actuator extends its output shaft, forcing the valve’s outlet stem down to open the outlet block and compress the Actuator spring.

2. As the system opens, a soft vent seal on the bottom of the outlet plug contacts a flat surface on the inside of the inlet plug stem. The spring energized vent seal is compressed until a metal to metal backup seat is made. At this point the outlet is open and the vent is fully closed. (Figure 2)

3. The valve continues to travel through vent closure, driving the inlet plug out of its seat and compressing the inlet spring.

4. When the inlet plug’s soft seal clears the seat ring, both blocks are open, the vent is closed, and gas moves from the inlet port to the outlet port. The valve stops at full open. (Figure 3)

Closing 1. For valve shutoff, the actuator is deenergized, causing the valve’s two independent return springs to close the block valves. (Inlet block spring and actuator return spring)

2. First, the inlet block closes, making first a soft seal, halting the flow of gas, and then over traveling to make a metal to metal backup seat. Next, the vent opens, relieving down-stream pressure. Finally, the outlet block closes, making a soft seal and then over traveling to make a metal to metal backup seat, isolating the vent from the burner.

3. With the inlet and outlet blocks closed and the vent open, any potential leakage past the inlet valve escapes to vent through the ported inlet stem. This positively ensures no leakage into the burner. (Figure 1)


Principles of Operation


Documents

Fabricated Body Gas Valve Systems...an automated shutoff system you can count on for safe, reliable performance – every time. No leaks. No out-of-sequence operation. And that’s